Monthly weather forecast and climate
Perma, MT

January, the same as December, in Perma, Montana, is a freezing cold winter month, with average temperature ranging between max 29.8°F (-1.2°C) and min 18°F (-7.8°C). In January, the average high-temperature is practically the same as in December - a still freezing cold 29.8°F (-1.2°C). Weather in January »

The last month of the winter, February, is another freezing cold month in Perma, Montana, with average temperature fluctuating between 17.6°F (-8°C) and 30.4°F (-0.9°C). In February, the average high-temperature is essentially the same as in January - a still subzero cold 30.4°F (-0.9°C). Weather in February »

March, the first month of the spring, in Perma, is a wintry month, with average temperature varying between 24.8°F (-4°C) and 39.2°F (4°C). In March, the average high-temperature marginally rises, from a freezing cold 30.4°F (-0.9°C) in February, to a cold 39.2°F (4°C). Weather in March »

April in Perma, Montana, is a frosty spring month, with average temperature ranging between min 29.8°F (-1.2°C) and max 48.7°F (9.3°C). In Perma, Montana, the average high-temperature rises, from a cold 39.2°F (4°C) in March, to a chilly 48.7°F (9.3°C). Weather in April »

May, the last month of the spring, in Perma, is an enjoyable month, with average temperature ranging between max 61°F (16.1°C) and min 36.7°F (2.6°C). In May, the average high-temperature increases, from a chilly 48.7°F (9.3°C) in April, to a comfortable 61°F (16.1°C). Weather in May »

The first month of the summer, June, is an agreeable month in Perma, Montana, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 43.3°F (6.3°C). In Perma, the average high-temperature slightly increases, from an enjoyable 61°F (16.1°C) in May, to a pleasant 68.5°F (20.3°C). Weather in June »

July in Perma, Montana, is a moderately hot summer month, with average temperature varying between 79.7°F (26.5°C) and 49.3°F (9.6°C). The warmest month is July, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 49.3°F (9.6°C). Weather in July »

The last month of the summer, August, is another warm month in Perma, Montana, with temperature in the range of an average high of 79.3°F (26.3°C) and an average low of 49.5°F (9.7°C). In Perma, the average high-temperature in August is essentially the same as in July - a still moderately hot 79.3°F (26.3°C). Weather in August »

September, the first month of the autumn, in Perma, is also an agreeable month, with temperature in the range of an average low of 42.3°F (5.7°C) and an average high of 68.5°F (20.3°C). In Perma, the average high-temperature drops, from a warm 79.3°F (26.3°C) in August, to an agreeable 68.5°F (20.3°C). Weather in September »

October, the same as September, is a cool autumn month in Perma, Montana, with average temperature ranging between max 51.8°F (11°C) and min 32.7°F (0.4°C). In Perma, the average high-temperature in October declines considerably, from a pleasant 68.5°F (20.3°C) in September, to a fresh 51.8°F (11°C). Weather in October »

November, the last month of the autumn, in Perma, is another cold month, with average temperature fluctuating between 37.2°F (2.9°C) and 24.4°F (-4.2°C). In Perma, the average high-temperature plummets, from a fresh 51.8°F (11°C) in October, to a cold 37.2°F (2.9°C). Weather in November »

The first month of the winter, December, is also a subzero cold month in Perma, Montana, with average temperature ranging between min 16.7°F (-8.5°C) and max 28.4°F (-2°C). The coldest month is December, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 16.7°F (-8.5°C). Weather in December »

What is the most humid month in Perma?

January is the most humid month in Perma, Montana, with an average relative humidity of 91%.

How much does it rain in Perma?

In Perma, during the entire year, the rain falls for 129.9 days and collects up to 13.5" (343mm) of precipitation.

When does it snow in Perma?

Months with snowfall in Perma are January through May, September through December.

How many days does it snow in Perma?

In Perma, during the entire year, snow falls for 67.1 days, and aggregates up to 28.27" (718mm) of snow.

What is the month with the least sunshine in Perma?

The month with the least sunshine is January, with an average of 4.7h of sunshine.

When does it snow the most in Perma?

February is the month with the most snowfall. Snow falls for 14.1 days and accumulates 6.5" (165mm) of snow.

What is the month with the lowest UV index in Perma?

Months with the lowest UV index are February and December, with an average maximum UV index of 1.

What is the rainiest month in Perma?

The month with the most rainfall in Perma, Montana, is June when the rain falls for 15.7 days and typically aggregates up to 2.2" (56mm) of precipitation.

When it does not snow in Perma?

In Perma snow does not fall in June through August.

When are the longest days in Perma?

With an average of 15.9h of daylight, June has the longest days of the year in Perma.

What is the warmest month in Perma?

July is the warmest month in Perma, Montana, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 49.3°F (9.6°C).

What is the driest month in Perma?

July and August are months with the least rain in Perma when the rain falls for 8 days and typically aggregates up to 0.63" (16mm) of rain.

What month has the most sunshine in Perma?

July has the most sunshine of the year, with an average of 11.8h of sunshine.

What is the month with the highest UV index in Perma?

With an average maximum UV index of 6, July is the month with the highest UV index in Perma.

What is the least humid month in Perma?

August is the least humid month in Perma, with an average relative humidity of 49%.

What is the coldest month in Perma?

December is the coldest month in Perma, Montana, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 16.7°F (-8.5°C).

What is the month with the shortest days in Perma?

With an average of 8.5h of daylight, December has the shortest days of the year.
Average temperature - Perma, MT
Average pressure - Perma, MT

The month with the highest atmospheric pressure is January (30.18").
The month with the lowest atmospheric pressure is June (29.92").

Average wind speed - Perma, MT

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest months (with the lowest average wind speed) are January, August and December (3.9mph).

Average rainfall - Perma, MT

The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.63").

Average rainfall days - Perma, MT

The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is August (7.4 days).

Average snowfall - Perma, MT
Average snowfall days - Perma, MT

The month with the highest number of snowfall days is December (14.5 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Perma, MT

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 4.7h).

Average sunshine days - Perma, MT
Average visibility - Perma, MT

Months with the highest visibility are April, May, June, July, August, September and October (6mi).
Months with the lowest visibility are January, February and December (4mi).